content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  import static org.junit.Assert.*;
  
  import org.junit.Test;
  
  import io.reactivex.common.TestCommonHelper;
  
  public class SingleInternalHelperTest {
  
      @Test
      public void utilityClass() {
          TestCommonHelper.checkUtilityClass(SingleInternalHelper.class);
      }
  
      @Test
      public void noSuchElementCallableEnum() {
          assertEquals(1, SingleInternalHelper.NoSuchElementCallable.values().length);
          assertNotNull(SingleInternalHelper.NoSuchElementCallable.valueOf("INSTANCE"));
      }
  
      @Test
      public void toObservableEnum() {
          assertEquals(1, SingleInternalHelper.ToObservable.values().length);
          assertNotNull(SingleInternalHelper.ToObservable.valueOf("INSTANCE"));
      }
  }
  